Treatment of artificial textile and like materials



1 *Patented Aug. 1938 UNITED STATES 2,125,902 I TREATMENT OF ARTIFICIAL TEXTILE AND LIKE MATERIALS I George Holland Ellis and Ernest William Kirk, Spondon, near Derby, England, assignors to Celanese Corporation of America, a corporation of Delaware No Drawing. Application-September 18, 1935 Serial No. 41,099. In Great Britain September 28, 1934 6 Claims.

This invention relates to improvements in the treatment of textile or like materials, and particularly to improved methods for the production of a scroop finish on artificial yarns, fabrics and similar materials, especially those containing cellulose acetate or other organic derivative of vcellulose. Y

The usual method for the production of a scroop finish on artificial silk materials comprises a treatment with oil or soap;and with an organic acid, for example acetic acid or formic acid. We have now found that a much more advantageous method is to deposit on the materials an acid compound obtainable by reacting upon a polybasic acid with abasic substance. According therefore to the present invention a scroop effect is imparted to artificial yarns fabrics and like products by such treatment.

The process of the invention enables a more pronounced and more permanent scroop effect to be obtained than is possible with formic or acetic acid. No soap or oil is necessary. Moreover, dyeings with certain dyestuffs, particularly -those of the 1.4-diamino anthraquinone type,

for example, l.4-di(methylamino) anthraquinone,

l-aminol-methylamino anthraquinone and 1.4.5.8.-tetra-amino anthraquinone, on materials L nent" to light than are similar dyeings on mate-.

rials treated with organic acids. This is of particular importance in connection with cellulose acetate and other organic derivatives of cellulose, since the most important blue dyestuffs for such materials are of the type referred to. The invention includes the production of dyed materials having a scroop finish, particularly materials having a basis of organic esters of cellulose dyid with dyes of the 1.4-amino anthraquinone ser es.

, The acidic compounds employed according to the present invention may be derivatives of polybaslc acids, and particularly of' poly-basic ali-' phatic acids, which still contain at least one free acidic grouping, for example acid salts of oxalic, tartaric, citric and other poly-basic aliphatic acids, particularly with sodium, potassium or other metals of the alkalic or alkali earth groups, ,or they may be derivatives of acids in which all the hydrogen atoms of the acidic groupings have been replaced by a group or groups which themselves contain acidic hydrogen. Examples potassium hydrogen tartrate and phthalimide. Preferably the compounds employed according to the present invention are substantially nonvolatile under the conditions to which the artifl cial materials may be exposed.

Other acidic compounds which may be employed with advantage in the process of the invention are complex salts of acid reaction formed from poly-basic acids, particularly aliphatic acids.

for example those referred to above, and amphoteric oxides, for example oxides oftitanium, tungsten, molybdenum, aluminium and tin.. The complex compounds employed should preferably have an acidic reaction in aqueous solution, and it has been found that potassiumtitanium oxalate is particularly suitable. The methods and conditions of application of this type of scrooping agent are similar to those described above in connection with the acidic derivatives of poly-basic acids.

'I'he treatmentwith the compounds of the'present invention may, ifdes'ired, be combined with a treatment with olive oil or other suitable oil or with soap as inthe case of the known scrooping processes. a

'The production of a scroop finish according'to the present invention may be carried out by immersingthe materials in. a solution of the compound employed'for a suitable period of time, for

example 15-30 minutes, at normal temperatures or somewhat increased temperatures, for example 30, 40 or 45 C., then removing the materials and expressing excess liquid so that the materials retain an amount of solution equal to about half to twice their weight and drying.

The acidic compounds may be used in anysuitable concentration. In general concentrations between 1 and 10 grams per litre, and particularly between 2 and 5 grams per litre will be found suitable.

be converted into water-insoluble compounds, for

example by treatment with solutions of salts of calcium, barium or other suitable metals in order to improve the permanency of the finish. Alternatively, water-insoluble compounds may be employed, e. g. in solution in a suitable solvent such as alcohol.

The following examples illustrate the invention:-

Example 1 A knitted fabric of cellulose acetate yarns is drawn slowly through a solution containing 5 Example 2 A fabric, as in Example 1, is similarly treated, but using a solution of 2 grams per litre of potassium titanium oxalate.

Example 3 A fabric woven from cellulose acetate staple fibre yarn is treated with a solution of 5 grams per litre of phthalimide. Hydroextractlon by suction follows,so that the fabric contains about 80% of its own weight ofthe liquor. It is then dried and otherwise treated as required.

In these examples instead of a fabric of cellulose acetate, fabrics or yarns of other artificial material such as cellulose propionate, cellulose acetate propionate, cellulose butyrate, cellulose acetate nitrate, ethyl cellulose, benzyl cellulose, or regenerated cellulose of the viscose or cuprammonium kind may be treated.

There may also be employed instead of the speciilc compounds described. in these examples, other acid compounds obtainable by reacting upon a poly-basic acid with a basic substance, for example potassium hydrogen citrate or sodium bicarbonate.

The process of the present invention isparticularly valuable in the treatment of artificial materials having a basis of cellulose acetate, but it is also applicable to the treatment of other-textile materials, e. g. natural silk and artificial materials containing regenerated cellulose.

What we claim and desire to secure by Letters Patent is:-

1. Process for the production of dyed artificial materials having an enhanced permanency to light, which comprises imparting a scroop effect to artificial yarns, fabrics and like products having a basis of cellulose acetate by depositing on the whole of said products an acid compound obtainable by reacting upon a carbon-containing polybaslc acid with a basic substance, and subsequently dyeing the material with a dyestufl? of the 1.4-diamino-anthraquinone type.

2. Process for the production of dyed artificial materials having an enhanced permanency to light, which comprises imparting a scroop effect to artificial yarns, fabrics and like products having a basis of cellulose acetate by depositing on the whole of said products a salt of acidreaction containing an alkali metal, a heavy metal and a polybasic organic acid radicle, and subsequently dyeing the material with a dyestuif of the 1.4;- diamino-anthraquinone type.

3. Process for the production of dyed artificial materials having an enhanced permanency to light, which comprises imparting a scroop effect to artificial yarns, fabrics and like products having a basis of cellulose acetate by depositing on the whole of said products an acid tartrate of an alkali metal, and subsequently dyeing the materials with a dyestufl of the 1.4-diamino-anthraquinone type.

4. Process for the production of dyed artificial materials having an enhanced permanency to light, which comprises imparting a scroop efiect to artificial yarns, fabrics and like products having a basis of cellulose acetate by depositing on the whole of said products potassium titanium oxalate, and subsequently dyeing thematerials with a dyestuif of the 1.4-diamino-anthraquinone type.

5. Process for the production of dyed artificial materials having an enhanced permanency to light, which comprises imparting a scroop effect to artificial yarns, fabrics and like products having a basis of cellulose acetate -by depositing on the whole of said products an im'ide of an organic polybasic acid, and subsequently dyeing the materials with a dyestuif of the lA-diamino-anthraquinone type. I

6. Dyed artificial yarns, fabrics andlike materials having an enhanced permanency to light and a scroop finish due. to the presence of an acid compound obtainable by reacting upon a carbon-containing polybasic acid with a basic substance and dyed with a dyestuif of diamino anthroquinone type.-

GEORGE HOLLAND ELLIS. ERNEST WILLIAM KERK.

the 1.4- 

